Why do men keep that one girl around?

That one girl who actually cares about him and is good to him but he doesn’t want anything serious but knows she wants more. Why does he continue to come back if he won’t be serious about her? Why not just let her go and let her move on? Why are some men like this? I don’t get it. Yes im talking about me. Been in this situation for years. The guy doesn’t let me “move on” keeps coming back. I’ve had it at this point cuz he's just not maturing at all.
Why do men keep that one girl around?
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